Spectrum

Vis-NIR reflectance spectrum of sublimating Water ice particles containing NH4-Nontronite and mixed with Magnetite, Antigorite, Dolomite at 173 K (t=15h)

Title
Vis-NIR reflectance spectrum of sublimating Water ice particles containing NH4-Nontronite and mixed with Magnetite, Antigorite, Dolomite at 173 K (t=15h)
DOI
10.26302/SSHADE/EXPERIMENT_OP_20200623_001
Data reference
Schroeder, Stefan; Poch, Olivier; Ferrari, Marco; DeAngelis, Simone (2019): Vis-NIR reflectance spectra of a mixture of Magnetite, NH4-Nontronite, Antigonite and Dolomite, pure, mixed with Water ice, during and after ice sublimation. SSHADE/CSS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20200623_001
Publications
Experiment type
laboratory measurement
Type
reflectance factor
Comments
At 1.3-1.5 µm, 1.8-2.0 µm and 2.4-3.0 µm, the spectrum is affected by measurement artifacts due to the presence of water vapor in the optical path.
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
Aluminum sample holder, closed by a sapphire window and cooled by a He cryostat in a vacuum chamber (Carbo-NIR)
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 500.0 - 660.0 20.0 3.2
#2 680.0 - 1380.0 20.0 6.3
#3 1400.0 - 2980.0 20.0 13.0
#4 3000.0 - 4180.0 20.0 26.0
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 long-pass filters of the spectro-gonio radiometer
Scan number
1
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
30.0°
Azimuth angle
0.0°
Phase angle
30.0°
Resolution observation
4.1°
Comments
The spectro-radio-goniometer SHINE was used in Gognito mode, as described in Potin et al. (2018, https://doi.org/10.1364/AO.57.008279), section D.2. The illumination beam was focused on an area of 6 mm in diameter on the sample, in order to increase the signal-to-noise ratio of our measurements.
Illumination
Observation
Comments
partial polarization variable with wavelength (from monochromator grating)
Observation mode
single spot
Resolutions
6.0 $mm$
Name
Sublimation residue made of mineral mixture (Magnetite 63wt%, NH4-nontronite 22wt%, Antigorite 9wt%, Dolomite 6wt%) on Water ice particles 67±31μm mixed with 1wt% of the same mineral mixture at 173 K
Changes
After 15.17h under high vacuum, the sublimation of water ice left a desiccated layer on top of the sample, made of the minerals which covers the ice particles still sublimating below this layer. This upper layer gets thicker with time, while the lower ice layer gets thinner with time.
Experiment
Vis-NIR reflectance spectra of a mixture of Magnetite, NH4-Nontronite, Antigonite and Dolomite, pure, mixed with Water ice, during and after ice sublimation
Date begin
2019-04-24
Release date
2020-11-02 14:08:06 UTC+0000
Version (Date)
#1 (2020-11-02 14:08:06 UTC+0000, Updated: 2020-11-02 14:08:06 UTC+0000)
History
Date Mode Version Status Comments
2020-06-26 09:24:51 UTC+0000 first import #1 valid version
Analysis
raw bidirectional reflectance spectrum calibrated: 1) with "Spectralon 99%" measured under same geometry using its absolute BRDF (0.50-1.10µm) and 2) with "Infragold" using its relative spectral reflectance (1.10-4.18µm)
Quality flag
4
Validator(s)